PHP正则表达式在括号中包含双反斜杠

Question

So I am trying to do a relatively simple php regex to check wether a string contains one of these characters: .,%$@/0123456789 but I also want to check wether it contains a double backslash (I don't want it to evaluate to true if it only contains one backslash) and I can't figure out how to do it. Any help would be appreciated :)

Here is what I was using so far:

preg_match('/[.,%$@\/0-9]/',$string)

I am not sur how to include the '\\\\' for the double backslash.

Thanks in advance!

Answer 1

You're just looking for your character set or a double backslash, right? So:

preg_match('/[.,%$@\/0-9]|\\\\/',$string)

Where | means "or".